钡添加剂对二次碱性锌电极性能的影响  

Effects of Barium on the Performance of Secondary Alkaline Zinc Electrode

作　　者：郑奕[1] 王建明[1] 陈华[1] 邵海波[1] 张鉴清[1] 

机构地区：[1]浙江大学化学系,浙江杭州310027

出　　处：《电化学》2004年第3期314-319,共6页Journal of Electrochemistry

基　　金：国家自然科学基金(59701008)资助

摘　　要：　采用直接化学合成法制备以钡作添加剂的二次碱性锌电极活性物质,样品的表面形貌及其晶态结构由SEM和XRD表征,并以循环伏安、充放电循环及电化学阻抗谱测定样品的电化学性能.实验表明,锌电极因Ba的添加而生成一种化学式为BaZn(OH)4·xH2O的锌酸钡,改善了电极的电化学性能.此外发现,Zn电极的电化学阻抗谱含有一个对应于电极表面放电产物覆盖率的时间常数.The active material of secondary alkaline zinc electrode with barium additives was prepared by a chemical reaction method and characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The electrochemical performance of various pasted Zn electrodes was investigated by cyclic voltammetry, charge/discharge method and electrochemical impedance spectra (EIS) technology. The addition of barium can synthesize a compound barium zincate with the molecular structure of BaZn(OH)_(4)· xH_(2)O and improve the discharge performance. The EIS of the various Zn electrodes showed two time constants besides diffusion impedance, including a state variable representing the covering degree of discharge products on the electrode surface.

关 键 词：钡 添加剂 二次碱性锌电极 电化学性能 锌酸钡 氧化锌 涂膏锌电极 

分 类 号：TQ151[化学工程—电化学工业]